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» Quadrats were harvested for aboveground biomass from eight plots within a tussock, watertrack, and snowbed community at 3 sites - acidic tundra and nonacidic tundra near Arctic LTER Toolik Plots and acidic tundra near Sagwon,Arctic LTER 1997.

Quadrats were harvested for aboveground biomass from eight plots within a tussock, watertrack, and snowbed community at 3 sites - acidic tundra and nonacidic tundra near Arctic LTER Toolik Plots and acidic tundra near Sagwon,Arctic LTER 1997.

Abstract:

Quadrats were harvested for aboveground biomass from eight plots within a tussock, watertrack, and snowbed community at 3 sites - acidic tundra near Toolik (site of acidic LTER plots), nonacidic tundra near Toolik Lake(site of non-acidic LTER plots), and acidic tundra near Sagwon. All vascular species were sorted, divided into new and old growth, dried, and weighed. Lichens were separated by genus in all quadrats. In half of the quadrats (n=4), mosses were separated by species. Moss and lichen data are presented by species elsewhere (see 97lgmosslichen.txt).

Date Range:

Friday, July 25, 1997 to Friday, August 1, 1997

Publication Date:

1999

Methods:

Plots were established in homogeneous vegetation in each of the communities at each site. Slope and aspect were as consistent as possible across the site locations. Eight 3 x 3 m plots were established and the corner of focus was chosen randomly. For harvest, a 20 cm x 20 cm quadrat was placed 20 cm away from the corner edges and all aboveground plant material was harvested. In the lab plant material was separated into lichen, moss, and vascular species. Lichens were separated to genus. In 4 quadrats at each community within each site, mosses were separated by species. In the other 4 mosses were lumped for total biomass only. Vascular species had belowground material removed, and were divided into current year?s growth and old growth. Harvesting and separating were conducted from 25 July through 1 August, 1997. All specimens were dried for at least 48 hours at 60 degrees C and weighed. Samples were then returned to Woods Hole, Mass. for nutrient analysis.
Supplemental Harvest (see 1997lgrarespbm.txt): In addition to the above harvest, a separate harvest was conducted in order to determine productivity of rare species not found in at least 4 quadrats per site. These species were selected based on the species measured for leaf level photosynthesis in summer 1997. A 1 m^2 quadrat with 20 x 20 cm areas marked off was used to determine visual percent cover of each of these species within the 9 m2 plots. Subsequently the same quadrat was placed on an area outside the plots, percent cover was estimated, and all aboveground biomass of the targeted species was harvested. This was done 4 times at each site/community for each species. The plant material was then processed in the same way as the other harvest.

Definition: Tissue category for biomass summaries: New above, old above, below, and non-vascular.

Type: Nominal

Missing values: None specified

Q1

Label: Q1

Definition: Grams of dry tissue per 20x20 cm^2 in Quadrat1

Type: Physical quantity

Unit: gramPerFourHundredthMeterSquared

Maximum: Not specified

Minimum: Not specified

Precision: Not specified

Missing values:

#N/A = Missing or Not Measured

Q2

Label: Q2

Definition: Grams of dry tissue per 20x20 cm^2 in Quadrat2

Type: Physical quantity

Unit: gramPerFourHundredthMeterSquared

Maximum: Not specified

Minimum: Not specified

Precision: Not specified

Missing values:

#N/A = Missing or Not Measured

Q3

Label: Q3

Definition: Grams of dry tissue per 20x20 cm^2 in Quadrat3

Type: Physical quantity

Unit: gramPerFourHundredthMeterSquared

Maximum: Not specified

Minimum: Not specified

Precision: Not specified

Missing values:

#N/A = Missing or Not Measured

Q4

Label: Q4

Definition: Grams of dry tissue per 20x20 cm^2 in Quadrat4

Type: Physical quantity

Unit: gramPerFourHundredthMeterSquared

Maximum: Not specified

Minimum: Not specified

Precision: Not specified

Missing values:

#N/A = Missing or Not Measured

Q5

Label: Q5

Definition: Grams of dry tissue per 20x20 cm^2 in Quadrat5

Type: Physical quantity

Unit: gramPerFourHundredthMeterSquared

Maximum: Not specified

Minimum: Not specified

Precision: Not specified

Missing values:

#N/A = Missing or Not Measured

Q6

Label: Q6

Definition: Grams of dry tissue per 20x20 cm^2 in Quadrat6

Type: Physical quantity

Unit: gramPerFourHundredthMeterSquared

Maximum: Not specified

Minimum: Not specified

Precision: Not specified

Missing values:

#N/A = Missing or Not Measured

Q7

Label: Q7

Definition: Grams of dry tissue per 20x20 cm^2 in Quadrat7

Type: Physical quantity

Unit: gramPerFourHundredthMeterSquared

Maximum: Not specified

Minimum: Not specified

Precision: Not specified

Missing values:

#N/A = Missing or Not Measured

Q8

Label: Q8

Definition: Grams of dry tissue per 20x20 cm^2 in Quadrat8

Type: Physical quantity

Unit: gramPerFourHundredthMeterSquared

Maximum: Not specified

Minimum: Not specified

Precision: Not specified

Missing values:

#N/A = Missing or Not Measured

Average

Label: Average

Definition: Average of all quadrats for that species and tissue type in Grams of dry per 20x20 cm^2

Type: Physical quantity

Unit: gramPerFourHundredthMeterSquared

Maximum: Not specified

Minimum: Not specified

Precision: Not specified

Missing values:

#N/A = Missing or Not Measured

Std. Err.

Label: Std. Err.

Definition: Standard error of the average g per quadrat

Type: Physical quantity

Unit: gramPerFourHundredthMeterSquared

Maximum: Not specified

Minimum: Not specified

Precision: Not specified

Missing values:

#N/A = Missing or Not Measured

Count

Label: Count

Definition: Number of quadrats

Type: Physical quantity

Unit: number

Maximum: Not specified

Minimum: Not specified

Precision: Not specified

Missing values:

#N/A = Missing or Not Measured

Average g/m^2

Label: Average g/m^2

Definition: Average of all quadrats expressed as g/m2

Type: Physical quantity

Unit: gramPerMeterSquared

Maximum: Not specified

Minimum: Not specified

Precision: Not specified

Missing values:

#N/A = Missing or Not Measured

StdERR g/m^2

Label: StdERR g/m^2

Definition: Standard error of average g/m ^2

Type: Physical quantity

Unit: gramPerMeterSquared

Maximum: Not specified

Minimum: Not specified

Precision: Not specified

Missing values:

#N/A = Missing or Not Measured

Count g/m^2

Label: Count g/m^2

Definition: Number of quadrats used for g/m^2

Type: Physical quantity

Unit: number

Maximum: Not specified

Minimum: Not specified

Precision: Not specified

Missing values:

#N/A = Missing or Not Measured

This material is based upon work supported by the National Science Foundation under Grants #DEB-1637459, 1026843, 9810222, 9211775, 8702328; #OPP-9911278, 9911681, 9732281, 9615411, 9615563, 9615942, 9615949, 9400722, 9415411, 9318529; #BSR 9019055, 8806635, 8507493. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.